“…The welding parameters, wire spacing and torch angle were flexibly adjusted to adopt different welding conditions, and the welding speed can achieve 1.8 m/min [ 17 , 18 ]. The problems of arc interruption and hump were also studied by Hua’s research group [ 19 , 20 , 21 , 22 ]. Fang et al [ 23 ] proposed a triple-wire indirect GMAW process, which consists of one main wire, two side wires and two power sources.…”